usb: Add 5 seconds limit to the status 0x90000 checking loop

Author: hanyazou

src/libfreenect2.cpp

@@ -735,7 +735,8 @@ bool Freenect2DeviceImpl::startStreams(bool enable_rgb, bool enable_depth)
   if (!command_tx_.execute(SetModeEnabledWith0x00640064Command(nextCommandSeq()), result)) return false;
   if (!command_tx_.execute(SetModeDisabledCommand(nextCommandSeq()), result)) return false;
 
-  for (uint32_t status = 0, last = 0; (status & 1) == 0; last = status)
+  int timeout = 50; // about 5 seconds (100ms x 50)
+  for (uint32_t status = 0, last = 0; (status & 1) == 0 && 0 < timeout; last = status, timeout--)
   {
     if (!command_tx_.execute(ReadStatus0x090000Command(nextCommandSeq()), result)) return false;
     status = Status0x090000Response(result).toNumber();
@@ -744,6 +745,9 @@ bool Freenect2DeviceImpl::startStreams(bool enable_rgb, bool enable_depth)
     if ((status & 1) == 0)
       this_thread::sleep_for(chrono::milliseconds(100));
   }
+  if (timeout == 0) {
+    LOG_DEBUG << "status 0x090000: timeout";
+  }
 
   if (!command_tx_.execute(InitStreamsCommand(nextCommandSeq()), result)) return false;